TopCoder

Topcoder is the world's largest technological network and on-demand digital talent platform, serving over 1.6 million developers, designers, data scientists, and testers globally. Topcoder enables companies like Adobe, BT, Comcast, Google, Harvard, Land O'Lakes, Microsoft, NASA, SpaceNet, T-Mobile, US Department of Energy, Zurich Insurance, and others to accelerate innovation, solve difficult business problems, and tap into hard-to-find technology skills.

TopCoder is a well-known platform with a close-knit community of expert programmers and developers. On the learning side, they feature a variety of weekly challenges and explanations, as well as difficult competitions to help you rise to the coding occasion. Competitive programming is a mind sport for solving coding problems using algorithms and data structure. The participants must write code while adhering to numerous constraints such as memory limitations, execution time, coding limits, space, and so on. The winner of competitive programming is determined based on the number of problems solved and the amount of time spent writing successful programming solutions. Coders who show their skill may earn money as freelancers solving pieces of digital projects for companies as elite as Harvard and NASA — and can even become project managers known as Copilots.

Website: topcoder.com